OM121 scanner is an ideal choice for the DIYER who looking to learn a little more about his car or truck inner workings. Although It's a small OBD II reader, it does all the basic functions. This basic unit can read out and also delete generic OBD2 trouble codes. If you are a car technician, you will urgently need this tool to assist you to find the fault. Autophix present you with the best auto diagnostic scanner which will help you save money and accurately diagnose any car problem.